INDEX. 



Acanthopterygia, . ... . . .92 



Achilleum cheirotonum, ...... 249 



fungiforme, ....... 249 



Alexander and Ducatel, their geological report, . . . 412 



Alleghany mountains, geological description of a portion of, . 251 



Portage railroad over, . . . 251 



AUegripus ridge, . . ... . . 184 



Analysis of some of the coals from the Richmond mine, . . 295 



hydraulic limestone of Pennsylvania, . . . 319 



Ancient lake, evidence of the existence of, .... 194 



Anthracite deposit at Tamaqua, . . . . . 326 



Argillaceous iron ore, ....... 192 



Armadillo, teeth of, ....... 43 



Armenia mountain, ....... 205 



Asaphus, . . . . . . . . 101 



crypturus, . . . . . . .37 



megalopthalmus, ...... 249 



Asterias antiqua, description of, ..... 233 



lumbricalis, ....... 234 



lanceolata, . . . . . . . 234 



obtusa, ........ 234 



areniola, . . . . . . . 235 



quinqueloba, ....... 235 



jurensis, ....... 235 



tabulata, . . . . . . . 235 



scutata, ....... 235 



stellifera, ... . . . • 235 



prisca, ........ 235 



Asterites, nondescript, . . . . . ■ • 235 



Astrea tessellata, . . . ... • 248 



alveolata., . . . . . . .249 



porosa, ........ 249 



Astreas antiqua, . . . . . . . -249 



Atlantic tertiary, observations on a portion of, ... 335 



Aulopora tubseformis, ....... 249 



serpens, . . . . . • • 24^ 



Aves, fossil, . . . • ■ • • .75 



